The building was renovated for the second time in 2005 after an earlier renovation in the 1990s.
The early renovations financed and overseen by the corporation were not generally the sort that attract public notice.
"It was uncovered during an earlier renovation," she said.
An entry in the school log book after the earlier renovation in 1914 might have been written today.
But only the first balcony and main floor, which lost its raked angle in an earlier renovation, will be open for now.
But 28-foot-high rooms were scarcely suited to that purpose, and that bedeviled numerous earlier renovations.
Air-conditioning is being added, as planned in the earlier renovation.
The 1907 station-house was the focus of an early 1990s in-house renovation.
A large cornice encircled the 27th floor and was removed during an earlier renovation.
They gutted the two downstairs bedrooms created in an earlier renovation, establishing a 400-square-foot space that nobody wanted to disturb.